P6-9A Wittmann Co. began operations on July 1. It uses a perpetual inventory system During July, the company had the following purchases and sales. Purchases Date Units Unit Cost $122 $136 $147 Sales Units July 1 July 6 July 11 July 14 July 21 July 27 Instructions (a) Determine the ending inventory under a perpetual inventory system using (1) FIFO. (2) moving-average cost, and (3) LIFO. ate and P6-10A ross ost all of its inventory in a fire on Decemberpsian